This issue seems to be related to an unresponsive remote control. First, we recommend you to check these links.
This process will allow you to control all the features on your set-top box as long as it is included on the supported devices list. This link will allow you to check the compatibility with your Slingbox.
Finally, you need to run the Configure TV sources process one more time and make sure to select the specific Zip Code and cable service provider according to your Slingbox location. This way, you will be able to get the channel guide.